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Willis Reservoir, UT Weather Forecast
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Willis Reservoir Weather Forecast
| TONIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | TUESDAY | WEDNESDAY | THURSDAY |
 |  | | | | |  |  | | | |
| Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Mostly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy |
| Lo: 59°FLo: 15°C | Hi: 71°FHi: 22°C | Lo: 55°FLo: 13°C | Hi: 70°FHi: 21°C | Lo: 55°FLo: 13°C | Hi: 70°FHi: 21°C | Lo: 55°FLo: 13°C | Hi: 70°FHi: 21°C Lo: 55°FLo: 13°C | Hi: 70°FHi: 21°C Lo: 55°FLo: 13°C | Hi: 70°FHi: 21°C Lo: 55°FLo: 13°C | Hi: 70°FHi: 21°C |
| POP: 20% | POP: 50% | POP: 40% | POP: 50% | POP: 20% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1244 PM MDT Thu Aug 20 2026 
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Issued: 522 PM MDT Thu Aug 20 2026
Key Messages
.KEY MESSAGES, Issued 136 PM MDT Thu Aug 20 2026...- Strong high pressure will bring hot temperatures to much of Utah on Thursday and Friday, especially across northern and central Utah where little relief from heat is expected.
- Monsoonal moisture will surge into Utah and southwest Wyoming Friday and Saturday, persisting through at least early next week. This will bring an increased threat of showers and thunderstorms capable of producing flash flooding.